Vibration dampening support for machines



July 22, 1952 ZElER I 2,604,283

VIBRATION DAMPENING SUPPORT FOR MACHINES Filed; July 17, 1948 2SHEETSSHEET 1 i INVENTOR Wafer? 1Q T'Zee'er WITNESS BY 2 ATTORNEZ F. F.ZEIER VIBRATION DAMPENING SUPPORT FOR MACHINES July 22, 1952 2SHEETS--SHEET 2 Filed July 17, 194

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11 INVENTOR wntz vEss ATTORNEY Patented July 22, 1952 VIBRATIONDAMPENING SUPPORT FOR MACHINES Frederick F. Zeier, Stratford, 'Oonn.,assignor to The Singer Manufacturing Company, Elizabeth, N. J., acorporation of New Jersey Application July 17, 1948, Serial No. 39,267

This invention relates to supports for machines and it has as an objectto provide an improved support which will dampen the vibrations set upby the machine and thereby deaden the noise normally producedby suchvibrations.

1 Claim. (Cl. 248-22) A high speed sewing machine, and especially I aso-called feed-off-the-arm sewing machine which is mounted in outboardfashion, is a good example of a machinewhich sets of substantialvibrations and produces considerable noise during its operation. Thisinvention will, for convenience, be shown and described in connectionwith that type of machine but it is to be understood that the inventionis equally adaptable to other types of machines.

With the above and other objects in view, as will hereinafter appear,the invention comprises the devices, combinations, and arrangements ofparts hereinafter set forth and illustrated in the accompanying drawingsof a preferred embodiment of the invention, from which the severalfeatures of the invention and the advantages attained thereby will bereadily understood by those skilled in the art.

In the drawings, Fig. 1 is a front elevation of a feed-ofi-the-armsewing machine and a supporting table therefor, embodying the presentinvention.

Fig. 2 is an end elevation of the machine and table shown in Fig. 1.

Fig. 3 is a plan view of the machine and the top of the table shown inFigs. 1 and 2.

Fig. 4 is an enlarged plan view of a portion of the table with two ofthe improved vibration dampening supports secured therein.

Fig. 5 is a vertical section on the line 55 of Fig. 4.

Fig. 6 is a vertical section on the line 5-45 of Fig. 4.

Fig. 7 is a vertical section on the line 1--1 of Fig. 4.

Referring more specifically to the drawings, the invention is disclosedas embodied in a sewing machine table comprising a frame includingvertically disposed and-vertically adjustable legs I, horizontalcross-braces 2 and a horizontally disposed table-top T secured upon theupper ends of said legs. The frame carries a machine-driving electrictransmitter M, having a pulley P which drives a machine operating beltB; a transmitter-controlling treadle C having operative connections,designated generally as c, with the transmitter; and a presser-footlifting treadle L connected, by means designated generally as m, withthe presser-foot lifter of a sewing machine hereinafter referred to.

A sewing machine s, shown herein as a feedofi-the-arm machine, ismounted upon the tabletop T through the medium of my improved vibrationdampening and sound deadening supports now to be described.

The table-top T is formed with a circular opening 3 and an elongatedopening 4. At opposite sides of the opening 3 the table-top is formedwith substantially semicircular cavities 5 which extend approximatelyhalf way through the table-top and afford spaced supporting ledges 6.Extending across the opening 3 and having its opposite ends restinguponthe ledges 5 in the cavities 5, and secured by suitable bolts is astrip of vibration dampening material 8 preferably,-but not necessarily,formed of a fibrous material impregnated with a suitable binder. Amaterial which has been found ideal for this purpose consists of layersof canvas impregnated with rubber and pressed into a relatively solidmass. The end portions of the strip 8 are formed with cavities 9 whichreceive the large heads ID of clamp bolts II, the shanks of which extendthrough the strip 8 and through apertures l2 in the ledges 6. Washers I3and nuts M on the threaded lower ends of the bolts draw the strip 8 intoclamping contact with the ledges 6 and maintain the ends of the strip inthe cavities with the upper surface of the strip projecting above theupper surface of the table-top T, as shown in Fig.5. 1

At the opposite ends of the elongated opening 4, the table-top likewiseis formed with cavities l5 and underlying ledges l6 upon which rest theend portions of a strip l! of vibration dampening and sound deadeningmaterial similar to that of which the strip 8 is made. The strip I1 isprovided with cavities 9' for the reception of the heads ID of bolts H,carrying Washers l2 and nuts l3, by means of which the strip I1 isclamped upon the ledges H; with the upper surface of the strip above theupper surface of the table-top in the same manner as the strip 8 isclamped upon the ledges 6.

The base a: of the machine S, has a three-point support on the strips 8and H, as will now be described; As shown most clearly in Figs. 3, 4

and 5, the right rear corner of the base has a foot or pad b which bearsupon the strip 8 between the opposite walls of the opening 3. This footis secured to the strip 8 by a bolt l8 and nut H! (see Fig. 5). At itsforward edge, the base a: has a two-point contact with the strip l'i. Asseen in Fig. 7, the right hand edge of the base a: is provided with afoot or pad I) which rests upon the member I! adjacent one end of 3 theelongated opening [4 and is secured to the member l1 by a bolt 20 andnut 2|. Near its opposite edge, the base has a depending boss 22 whichseats upon the member l1, adjacent the opposite end of the opening 4,and is held in contact with thatmemberrby a bolt 23.

It isto be notedrthat the feet N, b and the boss 22 each bears againstits associated vibration dampening member inwardly of and adjacent toone end of the opening 3, 4. Thus the weight of the base and the machinecarried thereby is transmited to the vibration dampening supports inshear relation with the walls of the openings and not merely throughcompression of the vibration dampening material.

From the foregoing, it will be apparent that this invention has provideda novel vibration dampening and sound deadening means for machines,which is efiective, relatively inexpensive,

. andwhichrmay bereadily embodied in theirame upon which ,the,.machineissupported.

Having thus set iorth the nature of the invention, What .I. claimherein.is:

A vibration-dampeningsuppor-tofor a machine, comprising, a horizontaltable-top having a ver- :ticaL opening extendingtherethrough and a pairof cavities having ,verticall .side .walls and a ;hori- -zontal-bottomwall and being disposed within the =.upper surface of said table-top andcommunicating with saidopeningiat opposite sidesthereof,

' an elongated resilientvibration-dampening-mem :ber having-a widthlessithan .thatrof saidopen- .-ing-. andgbeing disposed across. saidopening with each of the two opposite end portions of said member beingsnugly received within a respective one of said cavities, a pair ofbolts each including a threaded shank and an enlarged head, each of saidbolt shanks passing through a respective one of the opposite endportions of said member and the base-portion of a respective one of saidcavities, a nut mounted upon the distal end of each of said bolt-shanks,each of said bolts with its associated head and nut being effectiveforcibly to compress a respective one of the opposite end portions ofsaid member into its associated cavity and against the bottom wall ofsuch-cavity so that the opposite end portions of said member will havetheir marginal side wall portions supported by the corresponding sidewall portions of the cavities, and a stud passing throughan'intermediate portion of said member at'a location over said openingfor supporting a machine upon said'member.

REFERENCES CITED 'The'r following references .are of .record inc-thefile of this patent:

UNITED STATES PATENTS Number Name 7 Date 1810,1378 Ulrich .June 16, 19311,844,168 Knapp Feb. 9, 1932 1,937,055 Curtiss Nov. 28, 1933 2,147,660'Loewus Feb. 21,1939 2,179,469 Germonprez Nov. "7,1939 2,195,180.Marzettl .Mar."26, 1940

